I was debating between this and the orange kit but went with this so I could also use my retaliator as a pistol. It makes an amazing seal with the blue short dart breach, and performs excellently. I'm currently using it with the metal retaliator sled, metal catch, blue breach, and a 5kg alpha trooper spring. I don't have a chrono but based on comparing it to my aeon I'd say its hitting around 100-110. I put the included 12kg spring in but for indoor target shooting I found it a little too powerful but I'll bet at long range it would be great. Overall I'm very happy with this kit, very high quality.